Furnace Technology MCQs with answers Page - 11

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Admin • 833K Points
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Q. In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of

  • (A) Use of non-preheated combustion air
  • (B) Use of pulverised solid fuels
  • (C) Imperfect mixing of fuel & air and infiltration of air
  • (D) Use of excessive positive draft in the furnace

A

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Q. Presence of SO2 in furnace gases attacks the ferrous metal by way of

  • (A) Accelerating the rate of scaling
  • (B) Causing metal embrittlement
  • (C) Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature
  • (D) All of the above

A

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Q. The main function of a muffle in the muffle furnace is to

  • (A) Protect the charge from the effects of the products of combustion
  • (B) Smooth out temperature inequalities on the combustion side of the muffle wall
  • (C) Both A & B
  • (D) Neither A nor B

A

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Q. Which of the following is a periodic furnace?

  • (A) Tunnel kiln
  • (B) Rotary kiln
  • (C) Soaking pit
  • (D) Reheating furnace

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Q. Low stack loss indicates the

  • (A) Use of sub-stoichiometric air for combustion
  • (B) Efficient use of fuel
  • (C) Inefficient use of fuel
  • (D) Oxygen enrichment of combustion air

A

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Q. Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.

  • (A) 5
  • (B) 20
  • (C) 40
  • (D) 60

A

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Q. Rotary kilns are used in the

  • (A) Calcination of limestone & dolomite
  • (B) Cement manufacture
  • (C) Both A and B
  • (D) Neither A nor B

A

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Q. Regenerators are normally provided in the

  • (A) Glass melting furnace
  • (B) Open hearth furnace
  • (C) By product coke ovens
  • (D) All of the above

A

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Q. In a furnace employing forced draught as compared to induced draught,

  • (A) Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
  • (B) The fan operates hot and hence blades are liable to corrosion and erosion
  • (C) Positive pressure exists in the furnace
  • (D) None of these

A

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Q. Coke ovens in steel plant are heated by

  • (A) Electricity
  • (B) Blast furnace gas/mixed gas
  • (C) Coke oven gas
  • (D) Both B and C

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